34980

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 34.at n=10A031712
• Triangular numbers which are 6-almost primes.at n=24A076580
• Third row of Pascal-(1,6,1) array A081581.at n=38A081591
• Row sums of triangle A093922.at n=21A093925
• Triangular numbers that are sums of two consecutive primes.at n=29A111163
• Triangular numbers that are the product of 2 palindromes greater than 1.at n=28A115744
• a(n) = 1000*n - 20.at n=34A157515
• a(n) = 121*n^2 + 11.at n=17A158536
• The positions of zeros in A163898 and A163899.at n=37A165403
• Triangular numbers that are sums of twin prime pairs.at n=11A165966
• Number of nondecreasing arrangements of n+2 numbers in 0..4 with each number being the sum mod 5 of two others.at n=25A183907
• Triangular numbers k whose divisors can be partitioned into three disjoint sets whose sums are all sigma(k)/3.at n=19A206025
• Numbers n such that n and n^4 are sums of two twin primes.at n=4A212430
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x| >= w + |y-z|.at n=23A212714
• Triangular numbers which are leg of a Pythagorean triple with hypotenuse in A213188.at n=39A213189
• Number of ways of writing n as the sum of 10 triangular numbers from A000217.at n=16A226254
• Triangular numbers which have one or more occurrences of exactly five different digits.at n=24A241788
• Triangular numbers T such that both (T+2) and (T-2) are semiprimes.at n=38A242356
• Number of quadrilateral regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition).at n=18A333033
• a(n) = a(n-2) + 2*a(n-4) - a(n-10), with a[0..9] = [1, 1, 1, 1, 1, 2, 3, 5, 6, 9].at n=34A366143